Nickel cobalt manganese hydroxide precursor and preparation method thereof

Abstract

The invention belongs to the technical field of lithium ion battery materials, and particularly discloses a nickel cobalt manganese hydroxide precursor and a preparation method thereof. The precursor is of a dual-core twin structure and is provided with channels which are arranged in a radial shape from the center to the outside. The preparation method of the precursor comprises the following steps: adding pure water into a reaction kettle, performing nitrogen protection, and then pumping in a nickel-cobalt-manganese mixed metal salt solution containing an ammonium salt solution; after ammonia water is added into the reaction kettle, when no floccules are observed to be generated, pumping in the nickel-cobalt-manganese mixed metal salt solution, a complexing agent solution and a precipitator solution, and increasing the flow of the nickel-cobalt-manganese mixed metal salt solution further when a reaction slurry reaches a target value. The precursor prepared by the method is beneficial to lithium ion diffusion, good in consistency and excellent in performance; the preparation method is stable in process and has mass production conditions.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium batteries, and in particular relates to a precursor of nickel hydroxide, cobalt and manganese and a preparation method thereof. Background technique [0002] With the breakthrough of new technologies, the field of batteries has developed rapidly in recent years. As a mature material, lithium-ion batteries are widely used in 3C digital products and electric vehicles. Cathode material is one of the key materials of lithium-ion batteries. As the performance requirements of lithium-ion batteries are getting higher and higher, cathode materials and their precursors are also facing higher energy density, faster charge and discharge efficiency and longer battery life. The challenge of service life. Studies have shown that the above challenges require smoother lithium ion channels in cathode materials and fewer irreversible reactions during charge and discharge. The physical proper...

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Problems solved by technology

For example: the Chinese patent with the publication number CN113258062A discloses a precursor of a radial spherical cone-like structure with irregular shape, and lithium ions cannot enter the interior evenly during the lithium-mixed sintering process.

The Chinese patent with the notification number CN107342417B discloses that the interior of the precursor is a mononuclear structure, which does not provide as many radiation channels as dual-nuclear sites

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